Download or read book Return to the Sea written by Annalisa Berta and published by . This book was released on 2020-03-31 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: The life and evolutionary times of marine mammals, from giant whales and sea cows that originated 55 million years ago whose ancestors walked on land, to deep diving elephant seals and clam-eating walruses of modern times.